Layer 4 - TCP segment

• Source and Destination are 16-bit TCP port numbers (IP addresses are implied by the IP header)

• If no options, Data Offset = 5

Source Port

Destination Port

Sequence Number

Acknowledgement Number

Data Offset

Window

Reserved

ACK

URG

EOL

RST

SYN

FIN

Checksum

Urgent Pointer

Data

Padding

Options

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